1.) Never buy books from the bookstore.
The price markups are ridiculous, and they buy them back at the end of the semester at a fraction of the retail price, if they even buy them back at all. Save yourself the grief and buy them online or from your inner circle of financially struggling classmates. There are two advantages to this: 1.) You get your books at an incredibly cheaper rate, and 2.) You may even be able to sell them back to someone else at the end of the semester for a similar rate, resulting in a more reasonable net loss (or even gain).